A.T.A.C. 2.0 Size Zip 8 BootsThe boot worn by the world's leading public safety personnel, the 5. 11 A. T. A. C., just got promoted. It's lighter and more comfortable, yet maintains its reputation for toughness and durability. A new air flow tongue and full length dual durometer Ortholite footbed work to keep your feet cool, dry and comfortable all day, every day. Another new feature, the Achilles heel flex zone, gives a critical part of your foot more range of motion without